Solidification characteristics and mechanisms of cement treated Pb/Zn contaminated soils from a mining site in Hunan Province, China
by Mengjia Zhou; Haoliang Wu; Yanjun Du; Yucheng Yi
International Journal of Environment and Pollution (IJEP), Vol. 59, No. 2/3/4, 2016

Abstract: This paper presents a study on the stabilisation of mine soils from a mining site contaminated with heavy metals through the use of ordinary Portland cement (OPC). The aim of this study was to explore the effects of binder content (%), and the curing age of contaminated soils on the toxicity and strength properties of the contaminated soils using toxicity characteristic leaching procedure (TCLP), acid-neutralising capacity (ANC) test. Sequential extraction procedure (BCR), unconfined compression test (UCT), X-ray diffraction (XRD) and scanning electron microscopy (SEM) procedures were carried out to analyse the solidification mechanisms. The results showed that as the curing time was increased from 0 d to 28 d, OPC stabilised contaminated soil underwent several changes: 1) leaching of Zn and Pb decreased; 2) ANC (β) increased; 3) exchangeable Zn and Pb decreased; 4) residual contents increased; 5) strength improved.

Online publication date: Thu, 20-Oct-2016

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